US PATENT SUBCLASS 331 / 14
.~ With intermittent comparison controls

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331 /   HD   OSCILLATORS

1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
14.~ With intermittent comparison controls

DEFINITION

Classification: 331/14

(under subclass 1) Subject matter wherein means are provided to open and close the A.F.S. loop of the oscillator periodically. By way of example, a periodically actuated switch may connect the input of the comparator in the A.F.S. loop of an oscillator alternately to the oscillator output and the reference oscillator output.